If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#11
|
|||
|
|||
Glider near miss with Airliner (emergency climb) near Chicago yesterday?
On Monday, October 16, 2017 at 11:01:03 AM UTC-7, Dave Nadler wrote:
On Monday, October 16, 2017 at 12:57:35 PM UTC-4, Ramy wrote: This is disturbing news to hear that the military can not afford to comply with the ADS-B requirement while GA is required. And why the wingmen in formation turn off their transponders? Hi Ramy - IIRC, for civilian formation flying, procedure is normally the same; only one in formation has transponder on. Why? Because otherwise they all get interrogated at the same time, they all answer at the same time, and the result is unintelligible (this is called "fruiting", kinda like everyone shouting at the same time - even worse than RAS). In principal this is less of a problem with Mode S, except a mode S transponder behaves like an old Mode C when it gets an old-style interrogation. And while ground stations send new-style interrogation, older TCAS-I installations send the old-style interrogation. And these are installed in better-equipped GA aircraft like Lee's Bonanza. Darryl, please correct if I've garbled (fruited) this... Hope that's clear! Best Regards, Dave Yes that's right and with Mode S transponders primarily being interrogated by Mode S capable SSR you can likely leave multiple transponders on in a formation flight. I have no idea if the military ha moved to do that more recently or not. The selective interrogation of Mode S deals with what would otherwise be fruiting/overlap of the Mode A/C replies. Even with Mode C transponders I've had comments from controllers and radar techs that modern radar systems are able to deccorealate several closely based Mode C targets. I've got no hard numbers on that. Transponder use patterns is another thing to ask about when talking to ATC or airforce MACA reps etc. |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Stinson Airliner pics 1 [04/11] - Chicago Municipal Airport - American Airlines - Stinson Model A Tri-Motor.jpg (1/1) | Miloch | Aviation Photos | 0 | August 14th 17 02:55 PM |
Need to move a glider from Chicago to Los Angeles | Maciek Arkuszewski | Soaring | 14 | May 18th 16 11:59 PM |
Aug 6th B738 and Glider Near Miss. Frankfurt | Karen | Soaring | 70 | October 23rd 10 05:27 AM |
Glider-Airliner Near Miss | jcarlyle | Soaring | 0 | June 12th 07 04:52 PM |
Report on "Old" Glider/airliner midair? | Jim Kellett | Soaring | 5 | October 13th 03 02:20 PM |